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💾 Data Updated: 2025 HTS Revision 30 • Last updated: November 24, 2025

2933 - Heterocyclic compounds with nitrogen hetero-atom(s) only:

Sub-classifications

Commodity Code
Description

Overview

This category, HTS Code 2933, encompasses a broad range of organic compounds characterized by the presence of one or more nitrogen atoms within a ring structure, where no other type of atom (such as oxygen or sulfur) is part of that heterocyclic ring. These compounds are fundamental building blocks in organic chemistry and find extensive use across various industries, including pharmaceuticals, agrochemicals, dyes, and plastics. The defining feature is the nitrogen heteroatom within the ring system, differentiating them from other heterocyclic compounds that may include different heteroatoms.

Unlike sibling categories within Chapter 29 which might cover other classes of organic chemicals like alcohols, aldehydes, or acids, HTS 2933 specifically focuses on the nitrogen-containing heterocyclic framework. It is crucial to distinguish these from compounds where nitrogen is present but not as part of the ring system itself, or from inorganic nitrogen compounds. The classification here hinges on the molecular structure, specifically the presence and arrangement of nitrogen atoms within cyclic structures.

The subcategories within 2933 provide a hierarchical breakdown based on the specific type of nitrogen-containing heterocycle. For instance, some subdivisions are dedicated to compounds featuring unfused rings like pyrazole, imidazole, or pyridine, while others address more complex fused ring systems such as quinoline or isoquinoline. Further distinctions are made for compounds containing specific rings like pyrimidine or piperazine, or for lactams, which are cyclic amides. This granular classification allows for precise identification and tariff assignment based on the unique structural characteristics of each nitrogen heterocyclic compound.

Go up to Chapter 29: Organic chemicals

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